Jennifer Aniston is on the September 2013 cover of Glamour magazine and the actress is glowing. On the cover shot by Alexei Hay, J. An is wearing a black NARCISO RODRIGUEZ dress and a JENNIFER FISHER ring. You would think that because she always wears black on the red carpet, she would go for something different for a magazine cover.

Nonetheless she does look beautiful and happy. Jennifer was interviewed by her co-star Jason Sudeikis from the upcoming movie 'We're the Millers'. In the issue she talks about her fiance Justin Theroux, being happy, her new movie & more.

Continue below to read some excerpts from Jennifer's interview & to see more images from her fashion spread. For more info go to Glamour.com or pick up a copy when the issue hits newsstand on August 6th.

Jumpsuit, Valentino; necklace: Irene Neuwirth.

On being nice to Olivia Wilde when she caught flak for her monologue about her divorce & sex life:

"Well, that was because I felt so strongly about it, when I heard what
she was going through. I was so pissed. Because I related to it—I
related to that f--king feeling of people just wanting to rip down the
powerful, beautiful woman who [speaks her mind]. Stuff like that's so sh-tty. I don't like injustice. We're living in a
time where, whether it's the Internet or tabloids, being sh-tty has
become a sport. We're just grown-up bullies. We literally could not need
to have our hearts more open than in these times."

On parental instincts:

"I know Justin, for instance, has extremely amazing paternal instincts.
Because [growing up] he had to sort of become the parent. I think when
you have to become the parent when you're a younger person, you learn
those instincts."

On the advice she would tell her thirties self:

Thirties. Thirties. Go to therapy. Clean up all of the sh-t.
Clean up all of the toxins and the noise. Understand who you are.
Educate yourself on the self.

On being happy:

[But] you can undo a lot of things. If you're not happy, you can become
happy. Happiness is a choice. That's the thing I really feel. Like with
friends who refuse to get happy, who refuse to rise above the discomfort
of where they're at.